> For the complete documentation index, see [llms.txt](https://support.keyst.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.keyst.one/changelog/keystone-changelog/m-5.2-multi-coin.md).

# M-5.2 (Multi-Coin)

The multi-coin firmware M-5.2 includes the following updates:

1\. Keystone Hardware Wallet now supports three different kinds of BTC address formats: BTC Native Segwit, BTC Nested Segwit, and BTC Legacy. ([Tutorial](https://support.keyst.one/advanced-features/three-btc-address-formats-support-legacy-native-segwit-nested-segwit))

2\. The issue of BTC address reuse is fixed. 

{% hint style="warning" %}
**Please upgrade Keystone companion app to V1.1.0 or later to activate these new updates！**
{% endhint %}

{% content-ref url="/pages/WrjhRkEZzVT8cSWBWLyW" %}
[V 1.1.0](/changelog/keystone-companion-app/v-1.1.0.md)
{% endcontent-ref %}

{% content-ref url="/pages/AxNclEX4PKuusYGhWka3" %}
[Three BTC Address Formats Support](/advanced-features/s-da-a.md)
{% endcontent-ref %}

Tutorial for firmware upgrade:

{% content-ref url="/pages/-MVz-o9g8Dc-vlyVuAZj" %}
[Firmware Upgrade](/getting-started/firmware-upgrading.md)
{% endcontent-ref %}